first step to buffer redesign: class TerminalLine; discourage low level index access to cells

src/utils/TestUtils.test.ts

@@ -8,6 +8,7 @@ import { LineData, IInputHandlingTerminal, IViewport, ICompositionHelper, ITermi
 import { Buffer, NULL_CELL_CODE, NULL_CELL_WIDTH, NULL_CELL_CHAR } from '../Buffer';
 import * as Browser from '../shared/utils/Browser';
 import { ITheme, IDisposable, IMarker } from 'xterm';
+import { TerminalLine } from '../TerminalLine';
 
 export class MockTerminal implements ITerminal {
   markers: IMarker[];
@@ -145,8 +146,8 @@ export class MockTerminal implements ITerminal {
   refresh(start: number, end: number): void {
     throw new Error('Method not implemented.');
   }
-  blankLine(cur?: boolean, isWrapped?: boolean, cols?: number): LineData {
-    const line: LineData = [];
+  blankLine(cur?: boolean, isWrapped?: boolean, cols?: number): TerminalLine {
+    const line = new TerminalLine();
     cols = cols || this.cols;
     for (let i = 0; i < cols; i++) {
       line.push([0, NULL_CELL_CHAR, NULL_CELL_WIDTH, NULL_CELL_CODE]);
@@ -228,7 +229,7 @@ export class MockInputHandlingTerminal implements IInputHandlingTerminal {
   eraseLeft(x: number, y: number): void {
     throw new Error('Method not implemented.');
   }
-  blankLine(cur?: boolean, isWrapped?: boolean): [number, string, number, number][] {
+  blankLine(cur?: boolean, isWrapped?: boolean): TerminalLine {
     throw new Error('Method not implemented.');
   }
   prevStop(x?: number): number {
@@ -295,7 +296,7 @@ export class MockInputHandlingTerminal implements IInputHandlingTerminal {
 
 export class MockBuffer implements IBuffer {
   isCursorInViewport: boolean;
-  lines: ICircularList<[number, string, number, number][]>;
+  lines: ICircularList<TerminalLine>;
   ydisp: number;
   ybase: number;
   hasScrollback: boolean;
@@ -318,7 +319,7 @@ export class MockBuffer implements IBuffer {
   prevStop(x?: number): number {
     throw new Error('Method not implemented.');
   }
-  setLines(lines: ICircularList<[number, string, number, number][]>): void {
+  setLines(lines: ICircularList<TerminalLine>): void {
     this.lines = lines;
   }
 }